diff --git a/v3/pkg/application/window.go b/v3/pkg/application/window.go
index 002d5623..57b85dbf 100644
--- a/v3/pkg/application/window.go
+++ b/v3/pkg/application/window.go
@@ -25,6 +25,7 @@ type Window interface {
 	Focus()
 	ForceReload()
 	Fullscreen() Window
+	GetBorderSizes() *LRTB
 	GetScreen() (*Screen, error)
 	GetZoom() float64
 	HandleDragAndDropMessage(filenames []string)